When the TARDIS materialises just outside a sleepy English village, it appears the Doctor and Sarah Jane are nearly "home" at last. But all is not as it seems in rural paradise. White-suited, gun-wielding guards stalk the countryside, while the village itself is eerily deserted. As the Doctor and Sarah look on, a UNIT member leaps over a cliff to his death and, as the clock strikes twelve, the local pub is suddenly filled with strange robotic villagers. The UNIT member is amongst them, very much alive. What exactly is happening here?